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Certain One-Relator Products of Groups: Freiheitssatz and Non-Triviality

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Certain One-Relator Products of Groups: Freiheitssatz and Non-Triviality Certain one-relator products of groups: Freiheitssatz and non-triviality Ihechukwu Chinyere Submitted for the degree of Doctor of Philosophy Heriot-Watt University Department of Mathematics, School of Mathematical and Computer Sciences. November 6, 2015 The copyright in this thesis is owned by the author. Any quotation from the thesis or use of any of the information contained in it must acknowledge this thesis as the source of the quotation or information. Abstract Combinatorial group theory is an aspect of group theory that deals with groups given by presentations. Many techniques both geometric and algebraic are used in tackling problems in this area. In this work, we mostly adopt the geometric approach. In particular we use pictures and clique-pictures to describe various properties of certain one-relator product of groups. These groups are our object of study and they have presentations of the form G G = Λ ; N(w) where GΛ is a free product of groups Gλ2Λ and w is a (cyclically reduced) word in the free product GΛ with length at least two. It is known that most results about G are obtained by putting some conditions on the Gλ's, on w, or both. In the case where Λ = 2, say Λ = f1; 2g, there are two forms of conditions we put on w. The first condition is that w = rn, where r is cyclically reduced word of length at most eight and n > 0. More precisely suppose A and B non-trivial groups and G = (A ∗ B)=N(rn): Suppose that any of the following conditions holds: 1. `(r) = 8 and n ≥ 3; or 2.2 ≤ `(r) < 8 and n ≥ 2; or 3. n = 1 and `(r) = 4 say r = abcd, with ha; ci and hb; di isomorphic to 2- generator subgroups of P SL2(C). We show that at least one of the following holds: i. A and B embed in G naturally and r has order n in G. ii. n = 2 and up to conjugation r has the form r = axbx−1cz with z2 = 1, where a; b; c 2 A and x; z 2 B. We then deduce that r has order n in G. The other condition is that w = rn as before but we require also that r is a word in −1 hai ∗ hUbU i, where a; b 2 G1 [ G2 and U is a word in G1 ∗ G2. We prove that a minimal clique-picture over G satisfies the small-cancellation condition C(6) under the condition that r has no element of order two or r has length at least two in the −1 generators fa; UbU g and whenever both a and b belong to same factor, say G1, then either the subgroup of G1 generated by fa; bg is cyclic or hai \ hbi = 1. From this we deduce the following results. −1 n 1. Let H be the quotient of hai ∗ hUbU i by the normal closure of R . Then G1, G2 and H all embed in G via the natural maps. 2. If the word problems are soluble for H, G1 and G2, then it is soluble for G. 3. No proper cyclic sub-word of w is trivial in G. In particular r has order n in G. We also consider the case where Λ = 3, say Λ = f1; 2; 3g, and prove the following results. 1. Suppose G1, G2 and G3 are all finite cyclic groups, then each embed in G via the natural maps provided w has non-zero exponent sum in each of the generators. 2. If w has length at most eight, then G is non-trivial. 1 Acknowledgements I am most grateful to God Almighty for giving me life, good health and peace of mind throughout the period of this work. My deepest appreciation goes to my Supervisor Prof. Jim Howie who introduced me to combinatorial group theory and carried me along with his ideas and suggestions. I thank Prof. Bernd Schroers and Dr. Emma Coutts through whom I got to know about Jim and Heriot-Watt in general. Many thanks to Prof. Ingrid Rewitzky, Dr. Cornelia Naude and Dr. Bruce Bartlett for their assistance while I was at Stellenbosch University. Many thanks to my examiners Prof. Nick Gilbert and Dr. Martin Edjvet for the wonderful job done in reading my work. I also thank the entire HWU MACS staff who have worked together to make my stay here comfortable and successful. I thank my office mates and friends for their warm company. Special thanks to Bernard Oduoku for helping in the proof-reading. This work would not have been possible without the Maxwell Scholarship. I thank Heriot-Watt University for granting me this life time opportunity. Finally I thank my family for their love, prayer and support. It is you who have had to put up with my long period of absence. I hold you all in high esteem and would never let you down. Contents Introduction ii 0.1 Layout . .3 1 Preliminaries 5 1.1 Preamble . .5 1.2 Free groups and Group presentations . .5 1.3 Algorithmic problems . .6 1.3.1 Tietze transformations . .7 1.3.2 Nielsen Equivalence . .7 1.4 Free Product, Free Product with Amalgamation and HNN extension .8 1.4.1 Free Products . .8 1.4.2 Free Product with Amalgamation and HNN extensions . .9 1.5 Small cancellation . 11 1.5.1 Basic formulas . 12 1.5.2 Pictures . 13 1.5.3 Combinatorial curvature . 16 1.6 Bass-Serre Theory . 17 1.6.1 Group actions . 17 1.6.2 Group actions on graphs . 18 1.6.3 Theory of covering spaces . 19 1.6.4 Graph of groups . 19 1.6.5 The fundamental group of a graph of groups . 20 1.6.6 Group action on trees . 21 2 Short review of one-relator product of groups 24 2.1 Preamble . 24 2.2 One relator groups . 24 2.3 One relator product of groups . 25 2.4 One relator product of cyclics . 27 2.5 Relative presentations . 29 i CONTENTS 3 One-relator product induced from generalised triangle group 31 3.1 Preamble . 31 3.2 Periodicity . 33 3.3 Generalised triangle group description and refinements . 35 3.4 Clique-pictures . 37 3.5 Clique-labels and virtual periodicity . 42 3.6 The relator has free product length at least 4 and the pair (a; b) is admissible. 47 3.7 The relator has no letter of order 2 . 49 3.7.1 Proof of Theorem 3.7.1 . 58 3.8 Proof of Theorems . 62 4 One-relator product of two non-trivial groups with short relator 66 4.1 Preamble . 66 4.2 Preliminary results . 68 4.3 Relator of length eight with power n ≥ 3................ 73 4.4 Relator of length six with power n ≥ 2 ................. 79 4.4.1 Configurations of an interior vertex of degree 4 . 82 4.4.2 Configurations of an interior vertex of degree 5 . 88 4.5 Relator of length four with power n ≥ 2 ................ 99 4.6 Special case of n = 1 and relator has length four. 103 5 One-relator product of three non-trivial finite cyclic groups 106 5.1 Preamble . 106 5.2 S1-equivariant homotopy and degree of maps . 106 5.3 Main result . 109 6 One-relator product of three non-trivial groups with short relator112 6.1 Preamble . 112 6.2 Technical Lemmas . 113 6.3 Main result . 123 7 Conclusion and future work 124 7.0.1 Removing admissibility condition . 124 7.0.2 Solution of equations over free product of groups . 125 ii List of Tables 4.1 A table containing all the possible configurations of a positively- curved interior vertex. 74 4.2 A table containing all the possible configurations of a positively- curved interior vertex. 82 6.1 A table containing all the possible words R (up to cyclic permutation and inversion) in fU2;V g of index k, 1 ≤ k ≤ 3 and `(R) ≥ 2(6 − k). 119 iii List of Figures 1.1 Diagram showing bridge-move. 14 1.2 A graph with two edges and one vertex. 22 1.3 Graph of groups for free product of A and B.............. 22 1.4 Graph of groups for free product of A and B amalgamated over C.. 23 1.5 Graph of groups for HNN extension. 23 3.1 Push-out diagram. 31 3.2 Double push-out diagram. 36 3.3 Diagram showing an example of u ∼ v.................. 38 3.4 Diagram showing u and v joined by l=2 arcs after doing bridge-moves to Figure 3.3. 38 3.5 Diagram showing the l=2-zone in Figure 3.4 replaced by a single shaded rectangle. 39 3.6 Diagram showing two vertices u ∼ v joined by l-zone. 39 3.7 Diagram showing the l-zone in Figure 3.6 replaced by a single shaded rectangle. 39 3.8 Diagram showing a simply-connected clique consisting of only two vertices and how the two vertices are combined to form one single vertex. 40 3.9 Diagram showing a non-simply connected clique. 40 3.10 Diagram showing vertices v1 and v5 joined by a 2-zone and vertices v2 and v5 joined by a 3-zone. 41 3.11 Diagram showing a vertex v of degree five. 43 3.12 Diagram showing the case where only the special letters z0, zl=2 and zl are contained in zones . 52 3.13 Diagram showing the case where all four special letters z0, zl=2, zl and z3l=2 are contained in zones .
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